My God, I hate them.
They're not hippy by the way. All those stickers are applied on fume belching council chavette wagons driven by a 21 year old mum, who has 2 kids that she never sees since the council stepped in; She'll be wearing massive hoopy earrings and a towelling tracksuit, and the stickers will be applied to a clapped out silver Corsa, Micra or Ford Ka that hasn't passed an MOT in three years. The driver will be doing her nails while updating Facebook or Twitter, while driving through a zebra crossing, oblivious to the pedestrians she's just narrowly missed.